The following bids, mergers, acquisitions and disposals were reported by 2000 GMT on Friday: ** Spain will sell up to 49 percent of heavily indebted AENA, the world's biggest airports operator valued at around 16 billion euros ($22 billion), Public Works Minister Ana Pastor said on Friday. ** Germany's Siemens and Japan's Mitsubishi Heavy Industries are putting the finishing touches on a joint offer for Alstom's turbine businesses that includes a cash element of roughly 9 billion euros ($12.25 billion), sources close to the bidders said. As part of the deal, Mitsubishi and the French government would take equal stakes in Alstom, union representative said after a meeting with Economy Minister Arnaud Montebourg. The offer would counter an existing $17 billion offer from General Electric. ** Travel website operator Priceline Group Inc said it would buy OpenTable Inc for $2.6 billion in cash as it looks to add restaurant bookings to its services. ** The board of I